RoleHierarchy (spring-security-docs-manual 5.5.2 API)

All Known Implementing Classes:

NullRoleHierarchy, RoleHierarchyImpl
```
public interface RoleHierarchy
```
The simple interface of a role hierarchy.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.Collection<? extends GrantedAuthority>`	`getReachableGrantedAuthorities(java.util.Collection<? extends GrantedAuthority> authorities)`	Returns an array of all reachable authorities.

- Method Detail
  - getReachableGrantedAuthorities
```
java.util.Collection<? extends GrantedAuthority> getReachableGrantedAuthorities(java.util.Collection<? extends GrantedAuthority> authorities)
```
    Returns an array of all reachable authorities.
    Reachable authorities are the directly assigned authorities plus all authorities that are (transitively) reachable from them in the role hierarchy.
    Example:
    Role hierarchy: ROLE_A > ROLE_B > ROLE_C.
    Directly assigned authority: ROLE_A.
    Reachable authorities: ROLE_A, ROLE_B, ROLE_C.
    
    Parameters:
    
    authorities - - List of the directly assigned authorities.
    
    Returns:
    
    List of all reachable authorities given the assigned authorities.